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Block 6 Analysis of movement Lesson 5 Levers

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1st Class Lever Fulcrum in the middle. 2nd Class Lever Load in the middle ... Effort arm The shortest perpendicular distance between the fulcrum and the effort ... – PowerPoint PPT presentation

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Title: Block 6 Analysis of movement Lesson 5 Levers


1
Block 6 Analysis of movementLesson 5 Levers
2
Block 6 Analysis of movementLesson 5 - Levers
  • Lesson 5 Objectives
  •  

3
Syllabus Section Unit 1 PHED1
  • three classes of levers and examples of their
    use in the body related to the above specified
    sporting actions
  • relationship of levers to effective performance
  • mechanical advantages and disadvantages and
    range and speed of movement..

4
Collect in Homework
  • Check .
  • Notes on muscle fibres
  • Files checksheet
  • Review
  • Types of contraction

5
Review of Muscular contractions
  • Dynamic learning

6
Levers
  • Take 2 minutes with the person next to you to
    list where you might come across levers in
    everyday situations and why are they used?
  • What features does every lever have?
  • Fulcrum/pivot
  • Load
  • Effort

7
Levers
  • Levers can be classified into three classes of
    lever 1st, 2nd 3rd class levers
  • Dynamic Learning slides

8
1, 2, 3.. F, L, E.
  • You can identify the class of lever by
    identifying the middle component
  • 1st Class Lever Fulcrum in the middle
  • 2nd Class Lever Load in the middle
  • 3rd Class Lever Effort in the middle

L
E
F
E
L
F
E
L
F
9
Mechanical Advantage/Disadvantage
  • Key terms
  • Effort arm The shortest perpendicular distance
    between the fulcrum and the effort

E
Effort Arm
F
10
Mechanical Advantage/Disadvantage
  • Key terms
  • Load / Resistance arm The shortest
    perpendicular distance between the fulcrum and
    the load

Load Arm
L
F
11
Mechanical Advantage
  • Key terms
  • Mechanical Advantage The effort arm is longer
    than the load arm

Effort Arm
Load Arm
L
F
12
Mechanical Advantage
  • Key terms
  • Mechanical Advantage good for moving heavy
    loads but not very fast.

Effort Arm
Load Arm
L
F
13
Mechanical Disadvantage
  • Key terms
  • Mechanical Disadvantage The load arm is longer
    than the effort arm

Effort Arm
F
Load Arm
L
14
Mechanical Disadvantage
  • Key terms
  • Mechanical Disadvantage Good for moving fast
    with a good range of movement , but not
    efficient at moving loads

Effort Arm
F
Load Arm
L
15
Homework
Download the photos showing the three different
classes of lever and add notes to the pictures
from your textbook P53-55 Make notes on
Mechanical Advantage and Mechanical Disadvantage.
Download the Levers table from the PE Website
and identify the class of lever at each joint
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